Aratas was a centaur who united all the centaur tribes into a massive army in Desolace. To keep the Horde distracted, Aratas ordered his troops to attack several Horde farms and camps. He was eventually slain by the Garad'kra.

"My brothers and sisters - a new order has begun. An order of our ultimate incarnation. Centaur meant to rule this world. Azeroth has far too long been corrupted by the unworthy, foul creatures whose time has passed. Are you willing to follow me and drive these repulsive beings from our land? Are you willing to take what has always been yours?"[1]